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08-14-2016, 10:35 PM
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#1
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Member
Join Date: Jul 2016
Posts: 46
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Motorhome BLACK Tank Flush Inlet....Check valve?
I've got a 2004 Fleetwood Class A Moho & my fresh water inlet was leaking past the check valve So I replaced it. Decided to replace the BLACK FLUSH inlet Valve at the same time most of them on eBay have a Check Valve in them. The old one Does not have a Check Valve.
Seems like the check valve is gonna slow down the water a lot and You'd want good pressure when cleaning out the Black tank.
question is , Should I replace it with a NON-CHECK VALVE or WITH a check valve??
Thanks guys/girls
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2004 Fleetwood Excursion 39S
Several Harleys
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08-15-2016, 05:51 AM
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#2
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 28,823
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I didn't know black tank dumps had a "check valve"!
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Joe & Annette
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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08-15-2016, 06:48 AM
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#3
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Senior Member
Join Date: Aug 2012
Posts: 1,577
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I believe that most flush systems have a combined vacuum breaker and check valve just inside the wall. The vacuum breakers often dribble water by design, I eliminated mine. You can use either type, if you eliminate the vacuum breaker be sure to install a check valve.
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08-15-2016, 07:38 AM
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#4
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 28,823
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Quote:
Originally Posted by lynnmor
I believe that most flush systems have a combined vacuum breaker and check valve just inside the wall. The vacuum breakers often dribble water by design, I eliminated mine. You can use either type, if you eliminate the vacuum breaker be sure to install a check valve.
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I think we're talking about two different things. He was mentioning a check valve in the black tank dump, not the flusher.
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Joe & Annette
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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08-15-2016, 10:34 AM
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#5
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Senior Member
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,716
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Quote:
Originally Posted by MSHappyCampers
I think we're talking about two different things. He was mentioning a check valve in the black tank dump, not the flusher.
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I think the OP is talking about a black tank flush.
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2015 DRV Tradition 375KPS
2015 Chevy Duramax 3500HD LTZ Dually
Full-timers...Home is where we park it. 
Check out our blog: Living Our Dream
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08-15-2016, 10:39 AM
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#6
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Senior Member
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,716
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Quote:
Originally Posted by stetler
I've got a 2004 Fleetwood Class A Moho & my fresh water inlet was leaking past the check valve So I replaced it. Decided to replace the BLACK FLUSH inlet Valve at the same time most of them on eBay have a Check Valve in them. The old one Does not have a Check Valve.
Seems like the check valve is gonna slow down the water a lot and You'd want good pressure when cleaning out the Black tank.
question is , Should I replace it with a NON-CHECK VALVE or WITH a check valve??
Thanks guys/girls
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I use an vacuum breaker/backflow preventer on the end of the hose I connect to the black tank flush. I don't have either a check valve or a vacuum breaker built into the inlet or anywhere else like on the back side of the wet bay wall.
__________________
2015 DRV Tradition 375KPS
2015 Chevy Duramax 3500HD LTZ Dually
Full-timers...Home is where we park it. 
Check out our blog: Living Our Dream
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08-15-2016, 10:44 AM
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#7
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Senior Member
Join Date: Nov 2015
Posts: 4,928
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OP is asking about the black tank flush inlet connection.
The one on my 5vr has a check valve and doesn't restrict flow to flush system but I use a regulator set at 50# on water supply spigot with a 'Y' so both portable hose and general use hose are regulated
If you install one with a check valve just remember come time to winterize you will need to 'release/drain' water trapped via check valve in line up to anti-siphon vacuum breaker
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08-15-2016, 10:49 AM
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#8
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Senior Member
Join Date: Nov 2015
Posts: 4,928
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Quote:
Originally Posted by paz
I use an vacuum breaker/backflow preventer on the end of the hose I connect to the black tank flush. I don't have either a check valve or a vacuum breaker built into the inlet or anywhere else like on the back side of the wet bay wall.
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Are you sure???????
Anti-siphon vacuum breaker devices are required where cross-contamination is possible (not probable)
RV MFG. install under bathroom sink or sometimes in a closet (yes closet)
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08-15-2016, 05:24 PM
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#9
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Member
Join Date: Jul 2016
Posts: 46
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They say a picture is worth a thousand words. So here you go.
I guess the question is, Should I be buying one with OUT a Valve in it Just like this existing one?
All the ones I see have a Valve in it.
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2004 Fleetwood Excursion 39S
Several Harleys
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08-15-2016, 05:35 PM
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#10
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Senior Member
Join Date: Nov 2015
Posts: 4,928
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Quote:
Originally Posted by stetler
They say a picture is worth a thousand words. So here you go.
I guess the question is, Should I be buying one with OUT a Valve in it Just like this existing one?
All the ones I see have a Valve in it.

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WHY are you wanting to replace?
Have you had this MH since new?
That water connection looks like 'internals' (check valve) were removed
Put that one back on
Put a new one w/o check valve on
Put a new with check valve on
YOUR choice.........no right/wrong
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08-16-2016, 05:01 AM
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#11
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Senior Member
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,716
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Quote:
Originally Posted by Old-Biscuit
Are you sure???????
Anti-siphon vacuum breaker devices are required where cross-contamination is possible (not probable)
RV MFG. install under bathroom sink or sometimes in a closet (yes closet)
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Yep, had it apart. A sticker on the wall by the black tank rinse inlet says to use a back-flow preventer (vacuum breaker) on the hose. Same thing on our previous RV.
__________________
2015 DRV Tradition 375KPS
2015 Chevy Duramax 3500HD LTZ Dually
Full-timers...Home is where we park it. 
Check out our blog: Living Our Dream
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08-16-2016, 09:21 AM
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#12
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 28,823
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Quote:
Originally Posted by paz
I think the OP is talking about a black tank flush.
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You're right! I mis-read the post!
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Joe & Annette
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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